HNTs@CeO2-Au@Co3O4催化还原对硝基苯酚和染料污染物

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Abstract This paper reported the preparation of HNTs@CeO₂-Au@Co₃O₄ core-shell hollow tubular composite catalyst for the reductive degradation of aqueous p-nitrophenol (4-NP) and dye (MB, MO) pollutants. The microstructure and physicochemical properties of the catalyst were characterized by the means of TEM, SEM, EDS, XRD, N₂ adsorption-desorption, XPS, etc. The results showed that CeO₂ and Co₃O₄ were used as internal and external active layers to well disperse and immobilize Au nanoparticles (NPs), which were constructed upon halloysite nanotubes (HNTs) via interfacial reaction. The formed core-shell composite catalyst (HNTs@CeO₂-Au@Co₃O₄) was based on the HNTs carrier encapsulated by the CeO₂/Co₃O₄ laminated structure with Au NPs. The catalyst can reduce over 96% of 4-NP, MB and MO pollutants within 3.5, 8 and 3min respectively, in which the corresponding first-order kinetic rate constant (0.856, 0.370, 1.337min^-1) and turnover frequency (10.99, 1.90, 2.80min^-1) were significantly superior to the control materials including HNTs-Au@Co₃O₄, HNTs@CeO₂-Au and HNTs@CeO₂@Co₃O₄. Besides, HNTs@CeO₂-Au@Co₃O₄ catalyst maintained high reduction conversion of 4-NP, MB and MO pollutants and good structural integrity after 6 consecutive uses. The unique CeO₂/Co₃O₄ laminated structural feature and synergistic enhancement effect of composite components effectively promoted the construction of the high-performance catalytic system, greatly improved the catalytic activity and stability of Au NPs, which endowed the HNTs@CeO₂-Au@Co₃O₄ catalyst with remarkable catalytic capability and recycling performance.

Key words： Au nanocatalyst halloysite core-shell structure p-nitrophenol dye pollutants catalytic reduction

Received: 12 June 2023

PACS:

X703.5

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	Articles by authors
	FANG Jia-sheng
	CHEN Ming
	DIAO Qi-qi
	ZHAO Shuo
	HUANG Zhen-ting
	WEI Kun
	ZHUO Qiong-fang

Cite this article:

FANG Jia-sheng,CHEN Ming,DIAO Qi-qi等. HNTs@CeO₂-Au@Co₃O₄ catalyst for catalytic reduction of 4-nitrophenol and dye pollutants[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(1): 193-201.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I1/193

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